/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#region Utf8Json License https://github.com/neuecc/Utf8Json/blob/master/LICENSE
// MIT License
//
// Copyright (c) 2017 Yoshifumi Kawai
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#endregion

using System;
using System.Linq.Expressions;
using System.Reflection;

namespace Nest.Utf8Json
{
	internal static class ExpressionUtility
	{
		// Method

		private static MethodInfo GetMethodInfoCore(LambdaExpression expression)
		{
			if (expression == null)
				throw new ArgumentNullException(nameof(expression));

			return (expression.Body as MethodCallExpression).Method;
		}

		/// <summary>
		/// Get MethodInfo from Expression for Static(with result) method.
		/// </summary>
		public static MethodInfo GetMethodInfo<T>(Expression<Func<T>> expression) => GetMethodInfoCore(expression);

		/// <summary>
		/// Get MethodInfo from Expression for Static(void) method.
		/// </summary>
		public static MethodInfo GetMethodInfo(Expression<Action> expression) => GetMethodInfoCore(expression);

		/// <summary>
		/// Get MethodInfo from Expression for Instance(with result) method.
		/// </summary>
		public static MethodInfo GetMethodInfo<T, TR>(Expression<Func<T, TR>> expression) => GetMethodInfoCore(expression);

		/// <summary>
		/// Get MethodInfo from Expression for Instance(void) method.
		/// </summary>
		public static MethodInfo GetMethodInfo<T>(Expression<Action<T>> expression) => GetMethodInfoCore(expression);

		// WithArgument(for ref, out) helper

		/// <summary>
		/// Get MethodInfo from Expression for Instance(void) method.
		/// </summary>
		public static MethodInfo GetMethodInfo<TArg1, TArg2>(Expression<Action<TArg1, TArg2>> expression) => GetMethodInfoCore(expression);

		/// <summary>
		/// Get MethodInfo from Expression for Instance(with result) method.
		/// </summary>
		public static MethodInfo GetMethodInfo<T, TArg1, TR>(Expression<Func<T, TArg1, TR>> expression) => GetMethodInfoCore(expression);

		// Property

		private static MemberInfo GetMemberInfoCore<T>(Expression<T> source)
		{
			if (source == null)
				throw new ArgumentNullException("source");

			var memberExpression = source.Body as MemberExpression;
			return memberExpression.Member;
		}

		public static PropertyInfo GetPropertyInfo<T, TR>(Expression<Func<T, TR>> expression) => GetMemberInfoCore(expression) as PropertyInfo;

		// Field

		public static FieldInfo GetFieldInfo<T, TR>(Expression<Func<T, TR>> expression) => GetMemberInfoCore(expression) as FieldInfo;
	}
}
